This is a Harris Engineering Fixed known as the Bipod, model 1A2H.
Harris Engineering's 13.5"-23" High Fixed Ultra-Light Bipod is manufactured using high quality parts to ensure excellent function and sustainable use. It attaches to a Sling Swivel Stud. The bipod features an anodized matte black finish.
Features:
Legs Extend from 13.5 to 23
Hard Rubber Leg Caps
Aluminum Bipod with Steel Parts
Attaches to a Sling Swivel Stud